Parent/Child relationship

I am really new to ServiceDesk Plus and am trying to get a handle on how everything works. One feature I thought was available is a parent to child relationship in a request. Not a task or project, but a main ticket with sub tickets pertaining to the main issue. For example, if a ticket is created for an identified issue then other departments call in with the same problem, we want to track each report of the issue as its own ticket but have the relationship of the subsequent tickets be a child.

The view of the ticket in the request list would look something like this:

Ticket ID 001 Network failure (parent)

Ticket ID 002 Switch 123 reporting down (child 1)
Ticket ID 003 Switch 456 reporting down (child 2)
Ticket ID 004 Remote session requested to troubleshoot failure (child 3)

As in a project, each child ticket would need to be completed prior to closing the parent, but the issue is tracked as a Request where all techs would see it along with other open tickets in the Request list.

Can anyone point me in the right direction?

Thanks!